Operative surgery . Fig. 267.—Trephining, 234 OPERATIVE Pig. 268.—Increasing the size of the opening in theskull with the rongeur. the center pin and fasten it back in place, to prevent puncturing the mem-branes of the brain. Continue the operation, raising the instrument fromthe track and freeing it from bone dust with a brush provided for the purpose (Fig. 265, t). Ordinarilythe appearances of bonedust vary according to theadvance of the trephine;that of the diploe beingdeeply stained with blood,while that of the tables ofthe cranium is grayish incolor. The passagethrough the diplo
Operative surgery . Fig. 267.—Trephining, 234 OPERATIVE Pig. 268.—Increasing the size of the opening in theskull with the rongeur. the center pin and fasten it back in place, to prevent puncturing the mem-branes of the brain. Continue the operation, raising the instrument fromthe track and freeing it from bone dust with a brush provided for the purpose (Fig. 265, t). Ordinarilythe appearances of bonedust vary according to theadvance of the trephine;that of the diploe beingdeeply stained with blood,while that of the tables ofthe cranium is grayish incolor. The passagethrough the diploe ismarked by bloody detritus,by an easier and morerapid advance of the in-strument, and is attendedwith a softer sound. Whilegoing through the internaltable less pressure shouldbe made on the instrument,and the circular movementsshould be made lighter and quicker than before to avoid a precipi-tate entry of the cranium. At frequent intervals the end of a grooveddirector or of a trephine probe(Fig. 265, r) is introduced intothe track of the instrument to as-c
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